Measure dust density PM2.5 in the environment:
- Green light represents good air quality. It will be on when the dust particle concentration is below 100 µg/m3 .
- Blue light represents moderate air quality. It will be on when the dust particle concentration is between 100 -150 µg/m3 .
- Red light represents poor air quality. It will be on when the dust particle concentration is above 150 µg/m3